．The young often＿＿＿the old in our town．

Mary keeps talking about the party. She had a very good time,_______?

According to the recent regulation, it is required that any chemical plant that_______ along the river _______ to build a recycling center for the waste.

Either you or one of your students________ to attend the meeting that is due tomorrow.

---“Each of the students, working hard at his or her lessons,_____ to go to university.” ----“So do I.”